li:nth-child(1) {
  background-color: pink;
}
li:nth-child(2) {
  background-color: blue;
}
li:nth-child(3) {
  background-color: green;
}
li:nth-child(4) {
  background-color: purple;
}
.box {
  width: 580px;
  height: 360px;
  background-color: pink;
  background: url(1.jpg);
}
